Dreams have symbolic meanings. They often represent things that happened in your waking life that have not been resolved. If the dream is recurring it could mean something important to you remains unresolved. If you can identify the reason for your dream and understand why are having it, it can stop recurring. For example I often dreamed about falling down a a stair at my grandparents house well into my teens. When I told my dad about it, he said I had actually fallen down a stair at home when I was two years old. The dreams stopped after that. Here the dream symbol is really close to the real thing, but it could be different in your case.

"Dialing 911 in a dream is a "cry for help" and reflects feelings of concern about a period of emotional crisis. If you are dialing 911 in a dream or someone else is, identify the emergency or urgent situation you or that person wants help with in your/their waking life.  Getting a busy signal, no answer, the phone doesn't work, or you can't dial properly, reflect feelings of frustration, difficulty or failure to communicate your need for help with an "emergency" in your waking life." (Cmp.: https://www.dreamdoctor.com/index.php?option=com_dreams&controller=dictionary&task=details&id=1&Itemid=24)

So try to find out what your personal emergency could be, talk to someone about it and chances are the dreams are going to stop.